15. How is triction reduced in door hinges and machine parts:
A. By applying oil or grease.
B. By pouring water.
C. By putting rollers
D. By grinding to make it smooth.

14. Why should friction be increased between the vehicle tires and the road?
A. To avoid skidding
C. To run slowly
B. To protect the tires
D. To stop the vehicles slowly.

15. What causes objects to fall down after throwing them upward?
A. Friction
B. Gravity
C. Wind
D. Force

16. what kind of force puiis everything towards the center of the tart?
A. Friction
B. Gravity
C. Wind
D. Electricity

17. Which of the following may happen when there is no gravitational force?
A. Everything will float in space
C. Everything will be stationary
B. Everything will fly high.
D. Everything will slide on the ground.

18. Which of the following statements is true?
A. An object falls at steady speed.
B. An object falls faster as it nears the ground.
C. An object falls faster then becomes slower as it approaches the ground.
D. An object falls fast then it will bounce back.

paki sagot po ng mabuti!!​